The Thermal Annealing of Phosphorus-32 Formed by the Neutron Irradiation of Several Inorganic Phosphorus Compounds

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Thermal annealing curves given from the chemically-distributed phosphorus-32 formed by neuton irradiation in a nuclear reactor were obtained by heating several orthophosphates, sodium pyrophosphate, and disodium hydrogen phosphite samples in crystal. The separation was accomplished by one-dimensional paper chromatography. The amounts of phosphorus-32 in the chemical species different from the parent species decreased upon the heating of the salts, except in the case of sodium dihydrogen phosphite, whereas retention always increased.<BR>By the analysis of thermal annealing curves obtained from the initial distribution of activation energies, it was found that there was a difference between the thermal-annealing behavior of the polyphosphate fraction and that of the reduced species fraction. The activation energies of the polyphosphate fractions were in the range of 0.60 to 1.0 eV., but the pyrophosphate sample showed an exceptionally high value, i. e., 0.78 to 1.3 eV. Higher activation energy values were estimated for the annealing of the reduced species fraction than for those of the polyphosphate fractions.
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